chore: roll to 1.60.0-alpha-2026-05-05 #2879

Job	Run time
Java_21 (chromium)	6m 8s
stable (ubuntu-latest, chrome)	7m 46s
stable (windows-latest, chrome)	12m 33s
stable (windows-latest, msedge)	21m 13s
stable (macos-latest, msedge)	24m 31s
stable (macos-latest, chrome)	12m 2s
Java_21 (webkit)	9m 21s
dev (windows-latest, firefox)	20m 4s
dev (windows-latest, chromium)	12m 47s
dev (ubuntu-latest, firefox)	16m 52s
Java_21 (firefox)	11m 13s
dev (macos-latest, chromium)	9m 52s
dev (macos-15-xlarge, webkit)	8m 1s
dev (windows-latest, webkit)	30m 20s
dev (macos-latest, firefox)	21m 0s
dev (ubuntu-latest, chromium)	13m 23s
dev (ubuntu-latest, webkit)	11m 44s
	4h 8m 50s

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